Nara is served by Kansai International Airport and Osaka's Itami Airport (for domestic flights only). The site http://wikitravel.org/en/Nara provides useful information.
The easiest way to get to the area of the conference site from Kansai International Airport or Osaka (Itami) Airport is to take Airport Limousine to Kintetsu Nara Station. There's one bus in (almost) every hour. An alternative is to take trains, but you have to change trains once or twice.